June 20, 2003

Tetra Tech EM, Inc.

Mr. Thomas Alcamo
Work Assignment Manager (SR-6J)
Remedial Response Unit No. 1
U.S. Environmental Protection Agency Region 5
77 West Jackson Boulevard
Chicago, L 60604

Dear Mr. Alcamo:

Tetra Tech EM Inc. (Tetra Tech) has prepared the enclosed summary to document field sampling and oversight activities at the Winston-Thomas Wastewater Treatment Plant site on June 9, 2003. Viacom, Inc., is the responsible party for the site. The field sampling and oversight activities included sampling and gauging of on-site Groundwater monitoring wells. Appendix A is a site map and shows the monitoring wells referenced in the report. Appendix B contains a photographic log of field activities, Appendix C contains copies of Tetra Tech's field notes, and Appendix D contains Tetra Tech's Groundwater data sampling sheets. Tetra Tech's field sampling activities were performed in accordance with the field sampling plan submitted to and approved by the U.S. Environmental Protection Agency (EPA) on June 5, 2003.

If you have any questions about the enclosed summary, please call me at (312) 946-6491.

Sincerely,
Jeffrey Lifka
Site Manager

INTRODUCTION
Map

As requested by the U.S. Environmental Protection Agency (EPA) under Contract No. 68-W,6-0037, Work Assignment No. 944-ANLA-05ZZ, Tetra Tech EM Inc. (Tetra Tech) conducted field sampling and oversight activities at the Winston-Thomas Wastewater Treatment Plant site in Bloomington, Monroe County, Indiana, on June 9, 2003. Viacom, Inc. (Viacom), is the responsible party for the site. The project objectives were to conduct sampling and analysis of on-site groundwater monitoring wells in order to evaluate polychlorinated biphenyl (PCB) concentrations in on-site groundwater. On this date, (1) Tetra Tech collected groundwater samples from MOO-1 and MW-5I; (2) Tetra Tech gauged the depth to groundwater in MW-3D; and (3) Viacom's contractor, PSARA Technologies, Inc. (PSARA), collected groundwater samples from monitoring wells MW-3S, MW-3I, and MW-7.

This report summarizes field sampling activities and oversight activities conducted by Tetra Tech and its subcontractor, Earth Tech, Inc. (Earth Tech), on June 9, 2002; issues and developments; and future activities planned for the site. Appendix A contains a site map depicting the locations of the groundwater monitoring wells referenced in the text, Appendix B contains a photographic log of field saronling activities, Appendix C contains copies of Tetra Tech's field notes, and Appendix D contains Tetra Tech's groundwater sampling data sheets.

FIELD SAMPLING ACTIVITIES

Tetra Tech and Earth Tech arrived at the site at 10:00 a.m. Representatives from PSARA; City of Bloomington Utilities (CBU); and the Monroe County Health Department (MCHD) were present at the site. Tetra Tech and Earth Tech set up at MW- I to conduct the sampling (see Photograph No. 1 ) and were observed by Evelyn Brophy of CBU. MOO-I was purged at a flow rate of about 100 milliliters per minute (mL/min) for about 40 minutes using a peristaltic pump. About 0.02 foot of drawdown occurred in the well. At 11:25 a.m., pH, temperature, and specific conductance of the purged water had stabilized. The final values of these parameters are summarized in Table 1. At 11:35 a.m., Tetra Tech and Earth Tech collected a groundwater sample from MOO-I as well as matrix spike and matrix spike duplicate samples (see Photograph No. 2).

At 12:20 p.m., Tetra Tech and Earth Tech measured the depth to water in monitoring well MW-3D. The depth to water was about 10.03 feet below the top of the casing. This information is also shown in Table 1.

At 12:30 p.m., Tetra Tech and Earth Tech set up at MW-5I to conduct the sampling (see Photograph No. 3) and were observed by Evelyn Brophy of CBU, Resa Ramsey of the Indiana Department of Environmental Management (IDEM), and Dennis Williamson of MCHD. MW-5I was purged at a flow rate of about 80 mL/min for about 60 minutes. About 0.64 foot of drawdown occurred in the well. At 1:45 p.m., pH, temperature, and specific conductance of the purged water had stabilized. The final values of these parameters are summarized in Table I. At 1:50 p.m., Tetra Tech and Earth Tech collected the sample from MW-SI as well as a field duplicate sample.

Tetra Tech and Earth Tech performed the sampling in accordance with the field sampling plan submitted to and approved by EPA on June 5, 2003. The groundwater samples that were collected were shipped by overnight courier to TriMatrix Laboratories, Inc. (TriMatrix), in Grand Rapids, Michigan, for analysis of PCBs and total suspended solids. The purged water and other field sampling waste generated during the sampling were given to PSARA at the site for proper disposal.

FIELD OVERSIGHT ACTIVITIES

At the request of EPA, Viacom and PSARA scheduled groundwater sampling of monitoring wells MW-3S, MW-3I, and MOO-7 to be performed on June 9, 2003, in conjunction with Tetra Tech and Earth Tech. At about 2:35 p.m., after Tetra Tech and Earth Tech completed the field sampling activities described above, Tetra Tech observed PSARA purging monitoring well MW-3I (see Photograph No. 4). PSARA was purging water from the well at a low flow rate using a peristaltic pump and monitoring the discharged water for temperature, conductivity, and turbidity. At about 2:45 p.m., Tetra Tech and Earth Tech left the site to demobilize and take the sampling equipment used earlier back to Earth Tech's office in Bloomington. Tetra Tech resumed to the site about 1 hour later. PSARA had completed the sampling of MW-3I and was beginning to purge water from MW-3S. PSARA reported the well was being purged at a rate of about 90 mL/min and that the groundwater level in the well had decreased by about 0.1 foot.

After 35 minutes of purging, PSARA reported that the temperature, conductivity, and turbidity parameters had stabilized. PSARA then collected the groundwater sample from MW-3S, which concluded sampling efforts for the day. Monitoring well MOO-7 had been sampled by PSARA in the morning while Tetra Tech and Earth Tech sampled its wells. Tetra Tech left the site at 5:05 p.m.

ISSUES AND DEVELOPMENTS

The analytical results of the groundwater samples collected by Tetra Tech and Earth Tech will be reported once they become available from TriMatrix. Tetra Tech was not supplied with a work plan or standard operating procedures for the well sampling conducted by PSARA; however, it appeared that PSARA's techniques and methods for purging and sampling the wells were consistent with generally accepted practices for low-flow sampling.

FUTURE ACTIVITIES

Tetra Tech will perform future field sampling and oversight activities at the Winston-Thomas Wastewater Treatment Plant site as directed by EPA.